Signal-transmitting system



June 24, 1930.

F. A. KOLSTER SIGNAL TRANSMiTTING SYSTEM Original Filed July so, 1927INVENTOR geqer/tk ,4. ko/s/exr W A TTORNEYS I i I i ,and th'erefore coil-23v Willetfect a transfer of ener y: to theftransmission circuit." Theeffect of resonantrcircuit 27 notonly-permits 1 the field'of coil 23't0be unneutralized, but for theselected fremieng'zy, it also, causes acu-rrentrflow to occur between coils '23 and-2 I I ba'ckithru V i thedesired frequency coil Qicts'idditiyely rather than iii-opposition tocoil 23. f V I Insteadofgutilizingrthe system described ,above "for" V*quency of an arc converter, it is obvious that theinventionfrnaybeapplied 'foi selecti'ng a V I "harmonic frequency to theexclusion of other liarrnonic frequencie's and; th'etundanentalfrequency. f llifthis ease -th harmonic; fre Iquency j selected iron;the converter would probably be amplified before transferring the'sameto'the' translnissionlcircuit,' 3 In Fig; 21 hLYQillUSilffitCl theinvention incorporatedivith an electron emission tube.

' the resonant circuitwhich is fed i 'lcoils 23 'andQt, Therefore forusual type. ofthree element oscillator'tube '33 ff havingr its ,plateand grid circuits coupled to-- gal e es by rneans l of inductances and35 'lhis,oscillator maybe utilized-for trans-ferring'energy direct-tothe transmission cir-I J uit, or preferably itis employed as a masteroscillator. for. exciting theinput of e? powerv amplifying tub 6. gljhejoutputjofamplifier tube 36is connecteddii eetly to coils 23 andQ 'finjfamanner similar to that described with v 1 'jrespect'to Fig; 1 IQ-fil*sented"by' thejkeyrfi fThe' operation of this y t m i S b teetm'llYLthe ksame a tha {sli'own in' Fig-Q15 in that "the; energy 7 of unde-jsired; harmonics" repeated intheloutput of iilr r u 6 71 8 n ut a zed-{In Fig, .3 Iliavegillu'strateld amo'dification r V#ofthe,,fesonantfcircuit shownii nfliigs. lfandj 2: Inithis-hwfigure a MV grammatically(the;highjfrequency' generate eim 'an i' v I v.

lipp yi the nput f amp fi r 3 T resdnantcircuit eonsistsio't 'nd'uct'nee v451 in; eries "with 'capacite cesf' :andxthisf er si eh ly hlc 'r-aent'i patlij offcoil ar-by 3 Th degre ofeouplingbetw ametes-crush theleu rijenfl 7 1f Fm y ji ari dfihy eius 1 he e f ondenseri3gl'l heoperatiq l' of; -arangenient istheI same as the ysteni previ 'o'usly'c1escribed in that 'Wh'e circuit is tuned $01 $11 frequency; hiclrit iei of ener y of th system, means er y aid in series, dueto circulatorycurrent set up in selecting: I the fundamental fre-f I oscillator. Forexample Ihave fshownfthe;

ean my'b p oye were:

circuit fsaidjmethod', com risin adn iittin means producing frequenciesyotherthan J those desired, a transmission c rcu t, means for couplingthe generating means w th the] transmission circuit for "transfer ofenergy, a said means including apair of reactive ele 'inentselectrically associated with'zth'e genso as tojforrn brainchpaths forerajting means V flow of current, said pathsbelngof relatively lowimpedance for undesired i'reqllfincies,

said elements being so,fassociatedflwith the" transmission circuit thatWaves of'uiidesired, frequencies oppose each' other and do not, ,7afiect the"transinissionjcircuit," and a resonant f circuitcooperatively associated inone of said aths wher eby rehas -row band of,frequencies. said one branch path branch p desired presents a relatlvelyh gh-nnpedance y producing transmission circuit i ortransfer of anarrowbeing of relatiyel'yilojw impedance-forjcur;

2-. Ina radiotransinissionsystennfrneans f for generating radiofrequency, said rneans frequencies other than those" de sired, atranslnission circuit;means for; i Coupling the generating means withthe; r v

bandotide'sired "frequencies, said-nieans in- "eluding a pairof coilselectricallyassociated;

- withrthefgenerating meensso'as to 55017111 @WO: parallel pathsforjfiow of current; said paths 1 rentsof frequencies' fallingoutside,Said band,- f i said elements being coi ointlqy coupled to; thef f transmission circuitr so that the :e'fi'ects' onth 7 transmission;circuit currents of frequencoutside sai are substantially neutralized,and a sharp b i thrugbot-hsaid branches V a 1y; I :,e suit b mod tlng tued resonant circuit associated with ofe-f 'lee v of said pathswherebyffor said band of fire quenciea s'aid one path presentsarelativfelfy impedance; the; excitation of sai (liliesi T i *onantcircuit" from the; generating-- m'eansa -,causing current to fiowbe'tween' 'said coijls '1 .forthe desired-i requenoyband whereby-$0111i" s'aidband the I energy "to'the transmission circuit,

n l-e ho; transmission; systems .cheracte .zed

theg energy ofundesi harmonicsjto ibot; co ls wherebyj the Ee-i'iec of;such energy is neutralized respect tojthefti ansniissione v impedancefor energy'flow thru onefcoilgfoi?energy of the :circuit,;1jandiinposingja' high.

dGSllfCl i frequency, and whereby s e l i s t tran fe en r y band to thetransmission circ u I In' testin1ony-.Wher-e of my he EeEfnERre-irri Kencoils-act additively to"transfer 1;.

t- QTh'e-methodiofsuppressingfhar o 'ic's 1 1 9 b'yjheuse'off'apairg-oifcoils for: conjointly} 7' coupling a radio generator :t a"transmitting a

